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TPSM84209: Feed-Forward Capacitor PCB Placement

Andrew Keene
Prodigy 10 points
Part Number: TPSM84209

I'd like to utilize the Feed-Forward Capacitor (Cff) that WEBENCH tunes for me for the TPSM84209.  The PCB Layout from WEBENCH and the datasheet do not provide a placement location for this capacitor.  Is there a recommended location, for example, should it be placed between the Rfbt and Rfbb resistors or to the side of the resistors and close to the Vout plane?  Thank you.

--

Andrew

  • 0
    TI__Guru 50120 points

    Hi Andrew,

    Schematic-wise the Cff capacitor is placed between VOUT and FB just like the Rfbt resistor. You can simply place the Cff in parallel to the Rfbt component. Note that it is recommended to keep the feedback resistor divider as close as possible to the FB pin to reduce parasitics that can couple noise onto the sensitive FB node.

    Regards,

    Jimmy